21239817627 has 16 divisors (see below), whose sum is σ = 32367471872. Its totient is φ = 12136275360.

The previous prime is 21239817623. The next prime is 21239817647. The reversal of 21239817627 is 72671893212.

It is a happy number.

It is not a de Polignac number, because 21239817627 - 2² = 21239817623 is a prime.

It is a super-2 number, since 2×21239817627² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21239817623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 646113 + ... + 678189.

It is an arithmetic number, because the mean of its divisors is an integer number (2022966992).

Almost surely, 2^21239817627 is an apocalyptic number.

21239817627 is a deficient number, since it is larger than the sum of its proper divisors (11127654245).

21239817627 is a wasteful number, since it uses less digits than its factorization.

21239817627 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63618.

The product of its digits is 508032, while the sum is 48.

The spelling of 21239817627 in words is "twenty-one billion, two hundred thirty-nine million, eight hundred seventeen thousand, six hundred twenty-seven".